<?php

!defined('BASE_PATH') && die('forbidden');

class core_helper_json {
	
	public static function array2json($arr) {
		if(function_exists('json_encode')) return json_encode($arr); //Lastest versions of PHP already has this functionality.
		$parts = array();
		$is_list = false;

		//Find out if the given array is a numerical array
		$keys = array_keys($arr);
		$max_length = count($arr)-1;
		if(($keys[0] === 0) and ($keys[$max_length] == $max_length)) {//See if the first key is 0 and last key is length - 1
			$is_list = true;
			for($i=0; $i<count($keys); $i++) { //See if each key correspondes to its position
				if($i != $keys[$i]) { //A key fails at position check.
					$is_list = false; //It is an associative array.
					break;
				}
			}
		}

		foreach($arr as $key=>$value) {
			if(is_array($value)) { //Custom handling for arrays
				if($is_list) $parts[] = self::array2json($value); /* :RECURSION: */
				else $parts[] = '"' . $key . '":' . self::array2json($value); /* :RECURSION: */
			} else {
				$str = '';
				if(!$is_list) $str = '"' . $key . '":';

				//Custom handling for multiple data types
				if(is_numeric($value)) $str .= $value; //Numbers
				elseif($value === false) $str .= 'false'; //The booleans
				elseif($value === true) $str .= 'true';
				else $str .= '"' . addslashes($value) . '"'; //All other things
				// :TODO: Is there any more datatype we should be in the lookout for? (Object?)

				$parts[] = $str;
			}
		}
		$json = implode(',',$parts);

		if($is_list) return '[' . $json . ']';//Return numerical JSON
		return '{' . $json . '}';//Return associative JSON
	}
	
	public static function json2array($json){
		if(get_magic_quotes_gpc()){
			$json = stripslashes($json);
		}
		$json = substr($json, 1, -1);
		$json = str_replace(array(":", "{", "[", "}", "]"), array("=>", "array(", "array(", ")", ")"), $json);
		@eval("\$json_array = array({$json});");
		return $json_array;
	}
}
?>